Table 1.

Risk of bias assessment for the reference standard in Cochrane reviews of diagnostic tests for COVID-19

Author [Reference]	Test(s)	No. of studies	No. of participants*	No. (%) of studies at high risk of bias	No. (%) of studies at unclear risk of bias	No. (%) of studies at low risk of bias
Struyf et al. [11]	Signs and symptoms	44	26,884	3 (7)	8 (18)	33 (75)
Stegeman et al. [12]	Routine laboratory tests	21	70,711	14 (67)	5 (24)	2 (10)
Dinnes et al. [13]	Rapid, point-of-care antigen and molecular-based tests	78	24,087	66 (85)	6 (8)	6 (8)
Deeks et al. [14]	Antibody tests	54	15,976	17 (31)	24 (24)	13 (24)
Islam et al. [15]	Thoracic imaging tests	51	19,775	20 (39)	20 (39)	11 (22)
TOTAL	-	248	157,433	120 (48)	63 (25)	65 (26)

* or samples

Table updated on May 20th, 2021